Rock-drill



(No Model.)

T.- OFFICER ROGKDRILL. k

No. 5 0,463. Patented Apr. 13,1897

I V Wftornga UNI'IED STATES PATENT OFFICE.

"worms OFFICER, or OLAREMONT, ew HAMPSHIRE, ASSIGN TO THE SULLIVAN MACHINERY COMPANY, OF SAME PLACE AND ClII- 4 once, ILLINOIS.

Y I SPEGIEICATION' forming part of Letters Patent No. 580,463, dated April 13, 1897.

' z Application filed August 12,1898. Serial in. 602,500. on model-l full, clear,

10. .inder is employedwith' the piston, but holding said rifle-bar from rotation upon the upward stroke of the pie-- To a/ZZ whom it 172111411 cancel '21 I Be it known thatLTHOMAS Orrrcnn, a rest dent of Claremont, in the county'of Sullivan and State of New Hampshire, have invented a new and useful Improvement in Rock-Drills; and I do hereby declare the fol-lowing to be a and exact descriptidnthereof. My invention relates to rock-drills.

The special form of-rock drill to which my invention is applicable is that inwhich a cyla piston. opera-ting therein and -'a spiral rifle-bar working in a nut in the piston, together with mechanism at one end of said rifle-bar for permitting of the rotation of the rifle-bar upon thedescent of top, whereby the piston itself is turned upon the upward stroke.

The present-invention relates to an improved form of mechanism for holding the rifle-bar. during the will be fullyhereinafterset invention;

vention is applicable is her a therein upward stroke of the piston.

My invention comprise" certain [newfeatures inwthis fornfi of mech forth and claimed. To. enable. others skilled will describe the nying drawings, in which,-

7 Figure l is asectional view of the upper part of a common form of rock-drill to which my invention has been applied. Fig. 2 is a section on the line 2 2, Fig. 1. Fig.3 is a vertical sectional 'viewshowing -the rollers held out of engagement head. I p

Like letters indicate like parts in each .of theiignres; a

As the form of rock-drill to which niy inso well known, I have not deemedv it necessary to illustrate the valve mechanism" and the lower part of the apparatus, as there are diflereiit, forms of valvemechanism which may be used, and such valve mechanism ,forms no part of my with the ratchet- The letter n. represents the upper portion of asuitable cylinder havinga piston-cham together with valve-controlled nism, all'of which in the art to make der by means of ceive the rifle-bar cl. lhis rifle-bar has the spiral grooves d formed therein, said grooves within a recess e at the upper en'd of said piston. The upper end of therifle bar (1 passes through an opening in the-divisionbar is a ratchet-head g. This ratchet-head g has the teeth 9 formed in its circumferengaging with the rifle-bar nnt e, secured the cavity 0 formed therein, adapted to recollar fiand on-the upper end ofisaid rifle once. The upper end of the cylinder at has the enlargement of and within the Walls of said enlargement a ate formed the dovetailed seats h, within which are placed the dovetailed blocks These dovetailed blocks "11 have theinclined faces 11 and the recesses it formed on their inner faces. V Theblocksz are arranged at opposite points, but may be spaced as desired, in the enlargement aim the cylinder and have the openings it therein, into which the plugs Z are inserted. Springs m in recesses m ofthe enlargement a? press against said plugs and the nuts 7 screwing in said recesses m hold said springs in position." Engaging with the teeth q of the ratchet head g' are the rollerso said rollers being normally forced into engagement with said ratchet-headby means of the plugs l. 'The rollers 0 also'engage with the inclined faces 11 of the blocks i. I

L Resting on the upper end of the cylinder is the head 1), which is secured to said cylinthebolts p..-- This-head does 'not rest upon the ratchet-head g, is left between them to provide for I inovem'ent of said ratchet -head. Passingdown through threaded openings 7 in the ,head p are the set-screws. .9, said set-screws being placed in such position as to engage with the pper ends of the rollers owhen said rollers are forced into the. recesses q? in the but space the ready face of the head .1.

blocks 15, as will niore'fully hereinafter appear. rollers a extend above the ratchethead 9 into recesses 15, formed in the lower 2,-wh'ereupon the rollers will force back the P rollers o are in this position, and pressing down upon the upperend of said rollerslholds v said rollers-in said recesses away from en- 30. :gagement'with the teeth g of the ratchet-head 1 it urn in either direction, and consequently the piston does not revolve upon its upward ers engaging cylinder, substantially as set forth.

. ers engaging the teeth of said ratchet-head in engagement with said ratchet-head, sub- 5'5 ascent of the piston, however, the rifle-bar is held from rotation, as one of said rollers 0,

v turn upon its assent.

plugs l, actuated by the springs m, will im-- When my improved rock-drill is in operation and it is-desired to turn'the pistolron the upward stroke of the same, the parts will be in the position shown in Figs. 1 and 2. In that case as the piston descends the rifle-bar dwill be turnedin the direction of the arrow, Fig. 2, the rollers 0 permitting of the turning of 'theratchet-head g in that direction, owing to the fact that said rollers being pressed against the plugs Z by the teeth will push'back said plugs to permit said rollers to move into the recesses i formed by the inclined faces 71 of the blocks Upon the e gaging with the inclined face 2" of the blocks 1', prevents the ratchet-head from turning in the opposite direction, so that the piston will When it is desired to ,broach, as itis termed, and in which case the piston is not revolved, by turning the piston slightly the ratchet-head will be turned in the direction indicated by the arrow in Fig.

lugs land take position in the recesses '5 The set-screws s are then lowered while the g..- In thisway the ratchet-head is free tov stroke. Upon releasing said set-screws s the mediately force the-rollers. 0 hack into en-i gagement with the teeth of the ratchet-head.

secure by- Letters Patent, is-- 1.' In arock-drill, the combination with a suitable cylinder having a reciprocating piston therein, of .a spiral rifle-bar en gaging'said piston, a ratchet-head on said rifle-bar, rolltheteeth of said ratchet-head and inclined recesses on the inner face of said 2. In a rock-drill, the combination with a suitable cylinder having a reciprocating piston therein, of a spiral ri tle-bar engaging said. piston, aratchet-head on said rifle-bar, rolland inclined recesses on the inner face of said cylinder, and springs for holding said rollers stantially as set forth. J

p 3, In a rockedrill, the combination with a -W'hat I claim as my invention, and desire, t

suitable cylinder having a reciprocating piston therein, of a spiral rifle-bar engaging said piston, a ratchet-head on said rifle-bar, rollers engaging the teeth of said ratchet-head, dovetailed blocks fitting in corresponding recesses in said cylinder, said blocks having inclined recesses therein adapted to receive said rollers, and springs for holding said rollers in engagement withuthe teeth of said ratchethead, substantially as set forth.

4:. In a rock-drill, the combination with a suitable cylinder having a reciprocating piston therein, of a spiralrifle-ba'r engaging said piston,,a ratchet-head on said rifle-bar, rollers engaging the teeth of said ratchetshead,

said cylinder having recesses therein adapted to receive said rollers, andi neans for locking said rollers within saidrec"esses,substantially asset forth.

5. In a rock-drill, the combination with a suitable cylinder having areciprocatiug piston therein, of a spiral ri fle-bar engaging said piston, a ratchet-head on said riile-bar, rollers engaging the teeth of said ratchet-head, said cylinder havingreces'ses ijornie'd'therein adapted to receive said rpneiraiana set'scr'ews adapted to engage the ers and hold them stantially asset forthf 6. In a rock-drill, t

, nib i'nation wi tli a suitable cylinder havingare'c'ipr'ocating' pisv per endsof said roll- 1 ton therein, of a spiral rifle-bar engaging said piston, a ratchet-head on said rifle-bar, rollers engagiugihe teeth of said ratchet-=head and inclined recesses within said cylinder, and yielding plugs adapted to hold said rollers normally in en gagement'with"theteetlrof said ratchet-head, substantially setforth. ,7. In a rock-drill,ithe combinationwith a suitable cylinder having-a reciprocatingpis ton therein, of a spiral rifle-bar engaging said piston, a ratchet-head on said i'ifle' baig rollers engaging the teeth of'said' ratchet head and inclined f recesses formed in do\-'etailed blocks fitting within corresponding seats in said cylinder, plugs passing through said dovetailed blocks and adapted to bear against said rollers,'sprin in the rear of said blocks, and screws bearing against the outerends of said prings, substantiallyas set forth:

In t *timony whereof I, thesai'd lHOIiLit-a OF-rioEi-r, have hereunto set my9lnin1l p 'TI IO:\ [J\S'fOFF "Chili; \v'itnesses:

11.. II. Minions, FRANK A. BALL. 

